Role of relaxation in the quantum measurement of a superconducting qubit using a nonlinear oscillator

Details Role of relaxation in the quantum measurement of a superconducting qubit using a nonlinear oscillator Role of relaxation in the quantum measurement of a superconducting qubit using a nonlinear oscillator

2008-08-04

arxiv.org/abs/0808.0464v2

Physics

Condensed Matter

Superconductivity

4 pages, 4 figures

Scientific paper

10.1103/PhysRevB.78.132508

We analyze the relaxation of a superconducting flux qubit during measurement. The qubit state is measured with a nonlinear oscillator driven across the threshold of bifurcation, acting as a switching dispersive detector. This readout scheme is of quantum non-demolition type. Two successive readouts are used to analyze the evolution of the qubit and the detector during the measurement. We introduce a simple transition rate model to characterize the qubit relaxation and the detector switching process. Corrected for qubit relaxation the readout fidelity is at least 95%. Qubit relaxation strongly depends on the driving strength and the state of the oscillator.

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